| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.kafka.common; |
| |
| import java.net.InetSocketAddress; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.Optional; |
| import java.util.Set; |
| |
| /** |
| * An immutable representation of a subset of the nodes, topics, and partitions in the Kafka cluster. |
| */ |
| public final class Cluster { |
| |
| private final boolean isBootstrapConfigured; |
| private final List<Node> nodes; |
| private final Set<String> unauthorizedTopics; |
| private final Set<String> invalidTopics; |
| private final Set<String> internalTopics; |
| private final Node controller; |
| private final Map<TopicPartition, PartitionInfo> partitionsByTopicPartition; |
| private final Map<String, List<PartitionInfo>> partitionsByTopic; |
| private final Map<String, List<PartitionInfo>> availablePartitionsByTopic; |
| private final Map<Integer, List<PartitionInfo>> partitionsByNode; |
| private final Map<Integer, Node> nodesById; |
| private final ClusterResource clusterResource; |
| |
| /** |
| * Create a new cluster with the given id, nodes and partitions |
| * @param nodes The nodes in the cluster |
| * @param partitions Information about a subset of the topic-partitions this cluster hosts |
| */ |
| public Cluster(String clusterId, |
| Collection<Node> nodes, |
| Collection<PartitionInfo> partitions, |
| Set<String> unauthorizedTopics, |
| Set<String> internalTopics) { |
| this(clusterId, false, nodes, partitions, unauthorizedTopics, Collections.emptySet(), internalTopics, null); |
| } |
| |
| /** |
| * Create a new cluster with the given id, nodes and partitions |
| * @param nodes The nodes in the cluster |
| * @param partitions Information about a subset of the topic-partitions this cluster hosts |
| */ |
| public Cluster(String clusterId, |
| Collection<Node> nodes, |
| Collection<PartitionInfo> partitions, |
| Set<String> unauthorizedTopics, |
| Set<String> internalTopics, |
| Node controller) { |
| this(clusterId, false, nodes, partitions, unauthorizedTopics, Collections.emptySet(), internalTopics, controller); |
| } |
| |
| /** |
| * Create a new cluster with the given id, nodes and partitions |
| * @param nodes The nodes in the cluster |
| * @param partitions Information about a subset of the topic-partitions this cluster hosts |
| */ |
| public Cluster(String clusterId, |
| Collection<Node> nodes, |
| Collection<PartitionInfo> partitions, |
| Set<String> unauthorizedTopics, |
| Set<String> invalidTopics, |
| Set<String> internalTopics, |
| Node controller) { |
| this(clusterId, false, nodes, partitions, unauthorizedTopics, invalidTopics, internalTopics, controller); |
| } |
| |
| private Cluster(String clusterId, |
| boolean isBootstrapConfigured, |
| Collection<Node> nodes, |
| Collection<PartitionInfo> partitions, |
| Set<String> unauthorizedTopics, |
| Set<String> invalidTopics, |
| Set<String> internalTopics, |
| Node controller) { |
| this.isBootstrapConfigured = isBootstrapConfigured; |
| this.clusterResource = new ClusterResource(clusterId); |
| // make a randomized, unmodifiable copy of the nodes |
| List<Node> copy = new ArrayList<>(nodes); |
| Collections.shuffle(copy); |
| this.nodes = Collections.unmodifiableList(copy); |
| |
| // Index the nodes for quick lookup |
| Map<Integer, Node> tmpNodesById = new HashMap<>(); |
| Map<Integer, List<PartitionInfo>> tmpPartitionsByNode = new HashMap<>(nodes.size()); |
| for (Node node : nodes) { |
| tmpNodesById.put(node.id(), node); |
| // Populate the map here to make it easy to add the partitions per node efficiently when iterating over |
| // the partitions |
| tmpPartitionsByNode.put(node.id(), new ArrayList<>()); |
| } |
| this.nodesById = Collections.unmodifiableMap(tmpNodesById); |
| |
| // index the partition infos by topic, topic+partition, and node |
| // note that this code is performance sensitive if there are a large number of partitions so we are careful |
| // to avoid unnecessary work |
| Map<TopicPartition, PartitionInfo> tmpPartitionsByTopicPartition = new HashMap<>(partitions.size()); |
| Map<String, List<PartitionInfo>> tmpPartitionsByTopic = new HashMap<>(); |
| for (PartitionInfo p : partitions) { |
| tmpPartitionsByTopicPartition.put(new TopicPartition(p.topic(), p.partition()), p); |
| List<PartitionInfo> partitionsForTopic = tmpPartitionsByTopic.get(p.topic()); |
| if (partitionsForTopic == null) { |
| partitionsForTopic = new ArrayList<>(); |
| tmpPartitionsByTopic.put(p.topic(), partitionsForTopic); |
| } |
| partitionsForTopic.add(p); |
| if (p.leader() != null) { |
| // The broker guarantees that if a partition has a non-null leader, it is one of the brokers returned |
| // in the metadata response |
| List<PartitionInfo> partitionsForNode = Objects.requireNonNull(tmpPartitionsByNode.get(p.leader().id())); |
| partitionsForNode.add(p); |
| } |
| } |
| |
| // Update the values of `tmpPartitionsByNode` to contain unmodifiable lists |
| for (Map.Entry<Integer, List<PartitionInfo>> entry : tmpPartitionsByNode.entrySet()) { |
| tmpPartitionsByNode.put(entry.getKey(), Collections.unmodifiableList(entry.getValue())); |
| } |
| |
| // Populate `tmpAvailablePartitionsByTopic` and update the values of `tmpPartitionsByTopic` to contain |
| // unmodifiable lists |
| Map<String, List<PartitionInfo>> tmpAvailablePartitionsByTopic = new HashMap<>(tmpPartitionsByTopic.size()); |
| for (Map.Entry<String, List<PartitionInfo>> entry : tmpPartitionsByTopic.entrySet()) { |
| String topic = entry.getKey(); |
| List<PartitionInfo> partitionsForTopic = Collections.unmodifiableList(entry.getValue()); |
| tmpPartitionsByTopic.put(topic, partitionsForTopic); |
| // Optimise for the common case where all partitions are available |
| boolean foundUnavailablePartition = partitionsForTopic.stream().anyMatch(p -> p.leader() == null); |
| List<PartitionInfo> availablePartitionsForTopic; |
| if (foundUnavailablePartition) { |
| availablePartitionsForTopic = new ArrayList<>(partitionsForTopic.size()); |
| for (PartitionInfo p : partitionsForTopic) { |
| if (p.leader() != null) |
| availablePartitionsForTopic.add(p); |
| } |
| availablePartitionsForTopic = Collections.unmodifiableList(availablePartitionsForTopic); |
| } else { |
| availablePartitionsForTopic = partitionsForTopic; |
| } |
| tmpAvailablePartitionsByTopic.put(topic, availablePartitionsForTopic); |
| } |
| |
| this.partitionsByTopicPartition = Collections.unmodifiableMap(tmpPartitionsByTopicPartition); |
| this.partitionsByTopic = Collections.unmodifiableMap(tmpPartitionsByTopic); |
| this.availablePartitionsByTopic = Collections.unmodifiableMap(tmpAvailablePartitionsByTopic); |
| this.partitionsByNode = Collections.unmodifiableMap(tmpPartitionsByNode); |
| |
| this.unauthorizedTopics = Collections.unmodifiableSet(unauthorizedTopics); |
| this.invalidTopics = Collections.unmodifiableSet(invalidTopics); |
| this.internalTopics = Collections.unmodifiableSet(internalTopics); |
| this.controller = controller; |
| } |
| |
| /** |
| * Create an empty cluster instance with no nodes and no topic-partitions. |
| */ |
| public static Cluster empty() { |
| return new Cluster(null, new ArrayList<>(0), new ArrayList<>(0), Collections.emptySet(), |
| Collections.emptySet(), null); |
| } |
| |
| /** |
| * Create a "bootstrap" cluster using the given list of host/ports |
| * @param addresses The addresses |
| * @return A cluster for these hosts/ports |
| */ |
| public static Cluster bootstrap(List<InetSocketAddress> addresses) { |
| List<Node> nodes = new ArrayList<>(); |
| int nodeId = -1; |
| for (InetSocketAddress address : addresses) |
| nodes.add(new Node(nodeId--, address.getHostString(), address.getPort())); |
| return new Cluster(null, true, nodes, new ArrayList<>(0), |
| Collections.emptySet(), Collections.emptySet(), Collections.emptySet(), null); |
| } |
| |
| /** |
| * Return a copy of this cluster combined with `partitions`. |
| */ |
| public Cluster withPartitions(Map<TopicPartition, PartitionInfo> partitions) { |
| Map<TopicPartition, PartitionInfo> combinedPartitions = new HashMap<>(this.partitionsByTopicPartition); |
| combinedPartitions.putAll(partitions); |
| return new Cluster(clusterResource.clusterId(), this.nodes, combinedPartitions.values(), |
| new HashSet<>(this.unauthorizedTopics), new HashSet<>(this.invalidTopics), |
| new HashSet<>(this.internalTopics), this.controller); |
| } |
| |
| /** |
| * @return The known set of nodes |
| */ |
| public List<Node> nodes() { |
| return this.nodes; |
| } |
| |
| /** |
| * Get the node by the node id (or null if no such node exists) |
| * @param id The id of the node |
| * @return The node, or null if no such node exists |
| */ |
| public Node nodeById(int id) { |
| return this.nodesById.get(id); |
| } |
| |
| /** |
| * Get the node by node id if the replica for the given partition is online |
| * @param partition |
| * @param id |
| * @return |
| */ |
| public Optional<Node> nodeIfOnline(TopicPartition partition, int id) { |
| Node node = nodeById(id); |
| if (node != null && !Arrays.asList(partition(partition).offlineReplicas()).contains(node)) { |
| return Optional.of(node); |
| } else { |
| return Optional.empty(); |
| } |
| } |
| |
| /** |
| * Get the current leader for the given topic-partition |
| * @param topicPartition The topic and partition we want to know the leader for |
| * @return The node that is the leader for this topic-partition, or null if there is currently no leader |
| */ |
| public Node leaderFor(TopicPartition topicPartition) { |
| PartitionInfo info = partitionsByTopicPartition.get(topicPartition); |
| if (info == null) |
| return null; |
| else |
| return info.leader(); |
| } |
| |
| /** |
| * Get the metadata for the specified partition |
| * @param topicPartition The topic and partition to fetch info for |
| * @return The metadata about the given topic and partition, or null if none is found |
| */ |
| public PartitionInfo partition(TopicPartition topicPartition) { |
| return partitionsByTopicPartition.get(topicPartition); |
| } |
| |
| /** |
| * Get the list of partitions for this topic |
| * @param topic The topic name |
| * @return A list of partitions |
| */ |
| public List<PartitionInfo> partitionsForTopic(String topic) { |
| return partitionsByTopic.getOrDefault(topic, Collections.emptyList()); |
| } |
| |
| /** |
| * Get the number of partitions for the given topic. |
| * @param topic The topic to get the number of partitions for |
| * @return The number of partitions or null if there is no corresponding metadata |
| */ |
| public Integer partitionCountForTopic(String topic) { |
| List<PartitionInfo> partitions = this.partitionsByTopic.get(topic); |
| return partitions == null ? null : partitions.size(); |
| } |
| |
| /** |
| * Get the list of available partitions for this topic |
| * @param topic The topic name |
| * @return A list of partitions |
| */ |
| public List<PartitionInfo> availablePartitionsForTopic(String topic) { |
| return availablePartitionsByTopic.getOrDefault(topic, Collections.emptyList()); |
| } |
| |
| /** |
| * Get the list of partitions whose leader is this node |
| * @param nodeId The node id |
| * @return A list of partitions |
| */ |
| public List<PartitionInfo> partitionsForNode(int nodeId) { |
| return partitionsByNode.getOrDefault(nodeId, Collections.emptyList()); |
| } |
| |
| /** |
| * Get all topics. |
| * @return a set of all topics |
| */ |
| public Set<String> topics() { |
| return partitionsByTopic.keySet(); |
| } |
| |
| public Set<String> unauthorizedTopics() { |
| return unauthorizedTopics; |
| } |
| |
| public Set<String> invalidTopics() { |
| return invalidTopics; |
| } |
| |
| public Set<String> internalTopics() { |
| return internalTopics; |
| } |
| |
| public boolean isBootstrapConfigured() { |
| return isBootstrapConfigured; |
| } |
| |
| public ClusterResource clusterResource() { |
| return clusterResource; |
| } |
| |
| public Node controller() { |
| return controller; |
| } |
| |
| @Override |
| public String toString() { |
| return "Cluster(id = " + clusterResource.clusterId() + ", nodes = " + this.nodes + |
| ", partitions = " + this.partitionsByTopicPartition.values() + ", controller = " + controller + ")"; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| Cluster cluster = (Cluster) o; |
| return isBootstrapConfigured == cluster.isBootstrapConfigured && |
| Objects.equals(nodes, cluster.nodes) && |
| Objects.equals(unauthorizedTopics, cluster.unauthorizedTopics) && |
| Objects.equals(invalidTopics, cluster.invalidTopics) && |
| Objects.equals(internalTopics, cluster.internalTopics) && |
| Objects.equals(controller, cluster.controller) && |
| Objects.equals(partitionsByTopicPartition, cluster.partitionsByTopicPartition) && |
| Objects.equals(clusterResource, cluster.clusterResource); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(isBootstrapConfigured, nodes, unauthorizedTopics, invalidTopics, internalTopics, controller, |
| partitionsByTopicPartition, clusterResource); |
| } |
| } |